Korea VAT Calculator – Supply Value & Reverse VAT

What you enter is processed only in this browser and is never sent to a server. How it works

How to use

Choose the direction above. Supply value → Total incl. VAT adds 10% to a tax-exclusive amount; Total incl. VAT → Supply value splits a tax-inclusive amount into supply value and tax. Enter a whole-number amount in won to see all three figures and the formula.

Scope of the calculation

This calculator handles one transaction subject to the standard 10% rate under Article 30 of Korea’s Value-Added Tax Act. It does not determine eligibility for zero-rating or exemption, or calculate the VAT payable on a return. General taxpayers calculate VAT payable by taking account of input VAT and relevant deductions against output VAT. See the FAQ below for exceptional transactions and simplified taxation.

Formulas and rounding

Adding VAT: VAT = supply value × 10%; total = supply value + VAT. A supply value of ₩100,000 gives VAT of ₩10,000 and a total of ₩110,000.
Reverse calculation: VAT = total ÷ 11; supply value = total − VAT. A VAT-included amount is 110% of the supply value, so tax is 10/110, or 1/11, of the total. A total of ₩55,000 gives VAT of ₩5,000 and a supply value of ₩50,000.

This calculator rounds tax down to the nearest won. In reverse calculations it rounds tax first, then subtracts it from the total, so supply value and tax sum to the entered total. This is the tool’s calculation convention, not a legally prescribed rule for every invoice or return. When issuing an invoice, check the transaction details and the rounding rules of your invoicing system. The FAQ explains the 1-won difference caused by the order of rounding.

Sources

National Tax Service — VAT overview (in Korean) — VAT payable, deductions and simplified taxation
National Tax Service — VAT guide (in Korean) — 10% tax rate, general and simplified taxpayers
Korea Law Information Center — Value-Added Tax Act (in Korean) — Article 30 (tax rate), Articles 21–24 (zero rate), Article 26 (exemption), Articles 61 and 63 (simplified taxation)

Frequently asked questions

Why does dividing the total by 1.1 give a result that's off by 1 won?

It depends on which figure gets rounded first. Dividing ₩12,345 by 11 gives a tax of ₩1,122 and a supply value of ₩11,223. With 12,345 ÷ 1.1 = 11,222.7…, rounding the supply value down first gives ₩11,222 and the tax becomes ₩1,123. This calculator rounds the tax first. Either way, the supply value and tax always add up to the total.

Can simplified taxpayers use this calculator for their VAT payable?

This calculator only calculates 10% VAT on a single transaction, not the VAT payable by simplified taxpayers. The basic simplified-tax formula is supply proceeds × industry value-added rate (15–40%) × 10% − deductions. Exemption from payment and other rules must also be checked separately. Individual business owners with prior-year supply proceeds below ₩104 million may qualify, but excluded industries and other exceptions mean that revenue alone does not determine eligibility.

Are there transactions with no VAT?

Yes. Exported goods and similar transactions are zero-rated (0%) (Value-Added Tax Act Articles 21–24), and unprocessed foodstuffs and certain medical and educational services meeting the statutory conditions are exempt from VAT (Article 26). No 10% is added to these transactions.